Abstract: Based on solubility product calculation and thermal simulation experiments, precipitated phases in continuous casting slabs of non-oriented silicon steel were systematically studied at different hot charging and heating temperatures. When the hot charging temperature is below 950℃, the content and size of A1N remain unchanged, but the quantity and size of MnS and A1N-MnS increase when the hot charging temperature decreases, reach maximum and remain unchanged when the hot charging temperature is below 600℃. The total content of A1N and MnS solid solution in the slab heated at 1100℃ is less than that heated at 1200℃. Compared with the slab hot-charged at 850℃ and heated at 1100℃, the total content of A1N and MnS solid solution is less and the size of A1N and MnS is larger in the slab hot-charged at 600℃ and heated at 1100℃. The appropriate hot charging temperature and heating temperature are 600℃ and 1100℃, respectively.